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Engines Thomas > Chap 2 - Combustion Systems > Flashcards

Chap 2 - Combustion Systems Flashcards

1
Q

Components of a basic combustion chamber

A

Flame tube
Outer air Casing

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2
Q

Flame tube

A

Withsatmds very high pressure

Nimonic alloy

NO PEAK PRESSURES

Holes around circumstance for combustion and cooling

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3
Q

Outer Casing

A

Subjected to lower temperatures

Alloy steel

Overheating will show - discolouration

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4
Q

What percentage of air goes through the combustion chamber

A

18-25%

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5
Q

What is the dilution zone used for

A

Cool the hot gases to a acceptable temperature

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6
Q

What is the primary zone

A

Air enters combustion chamber through swirl vanes and mixs with atomizer fuel from burner nozzle or flare stabilises the flame by creating slow moving zone of air

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7
Q

What is the air/fuel ratio in combustion chamber

A

60:1

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8
Q

Two main combustion chambers

A

Annular
Reverse flow

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9
Q

Annular chamber

A

Circular flame tube which allows the compressor shaft to go through the center

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10
Q

Adv of annular combustion

A

Good utilisation of area

Structural part of engine

Annular gas flow

High efficency

Large total combustion area

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11
Q

Reverse flow combustion chamber

A

Has been shortened in overall length

Looks like a U shape

Good for helicopters

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12
Q

Cushion chamber drains

A

Use an automatic drain valve
Combustion chamber pressure falls off the spring will open the drain

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13
Q

Fuel nozzles (burners)

A

Introduce fuel into the combustion chamber

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14
Q

Two types of fuel nozzles

A

Atomizer and vaporisers

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15
Q

Three absinthe types of atomizers

A

Duplex
Rotary
airspray nozzle

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16
Q

Duplex atomizer

A

Two independent orifices
Smaller one operates lower flows
Bigger one operates higher flows

Both can be used when pressure and fuel flow is high

17
Q

Rotary atomizer

A

Centrifugal motion will eject the fuel

18
Q

airspray nozzle (looks like a golf tee)

A

Mixes primary combustion with injected fuel
Reduction in carbon and exhaust smoke
Low pressures required to atomize the fuel

19
Q

Vaporiser

A

sprayed from feed tubes into vaporising tube.
Tubes are heated by combustion and fuel is therefore vaporised before passi g intot the flame tube

20
Q

Adv of vaporisers

A

Produce less smoke
Flame can be stabilised
Combustion zone is shorter
Filters are used to protect the burner from debris

Engines Thomas (5 decks)

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